Air humidifying furnace



June 4, 1932- R. SANDWICK ET AL AIKR HUMIDIFYING FURNACE Filed Nov. 1, 1930 4 Sheets-Sheet ATTORONEY June 14, 1932. R SANDWlcK AL 7 1,862,985

AIR HUMIDIFYING FURNACE FiledNov. 1, 1950 4 Sheets-Sheet 2 INVENTORS ATTOR NEY June 14, 1932. R. SANDWICK ET AL AIR HUMI DIFYING FURNACE Filed NOV. 1, 1930 4 She6t$-$heet 3 ATTORNEY June 14, 1932. R. SANDWICK ET AL AIR HUMIDIFYING FURNACE Filed Nov. 1, 1930 4 Sheets-Sheet 4' BY mvENToRS ATTORNEY Patented June 14, 1932 UNITED STATES PATENT OFFICE ROBERT SANDWICK, OF SCOBEY, MONTANA, AND EMIL DAI{IISTROM OE JAMESTOYVN,

NORTH DAKOTA AIR HUMIDIFYING FURNACE Application filed November 1; 1930. Serial No. 492,838.

'This invention relates to certain new and useful improvements in furnaces of the hot air type embodying among other characterisics the provision and arrangement of a circulating smoke flue for the purpose of utilizing the heat from the fuel to the utmost thereby increasing the heating capacity of the furnace whereby the maximum amount of heat or minimum amountof fuel may be derived.

Another of the objects of the invention consists of a water trough upon the smoke flue.

An additional object of the invention comprises the arrangement of the several whirls or coils of the circulating flue in staggered relation whereby the overflow of the water precipitating from one coil or whirl to the other will be assured.

.Vith the above and other objects in view the invention further consists of the following novel features and details of construction. to be hereinafter more fully described. illustrated in the accompanying drawings and pointed out in the appended claims.

In the drawings:

Figure 1 a vertical sectional view taken through the invention.

Figure 2 is a vertical sectional view taken on line 2-2 of Figure 1.

Figure 3 is a horizontal sectional view taken on line 33 of Figure 1.

Figure 4 is a fragmentary longitudinal sectional view taken through the stove and smoke fines and illustrative of the particular construction involved and the circulation of the smoke and heat therethrough.

Figure 5 is a fragmentary horizontal sectional view taken through the front of the furnace showing the connectors for those whirls or coils of the smoke fine to opposite sides of the fuel door.

Referring to the drawings in detail wherein like characters of referencedenote corresponding parts, the reference character indicates generally the housing of our particular form of hot air furnace which forms a heat collecting dome 11 within the top thereof having outlet pipes 12 in communication therewith. The stove heating chamber 13 is provided with a combination grate and fire brick or clay support in the nature of a ring 14.

The compartment 15 defined between the adjacent walls of the housing 10 and stove heating chamber 13 has its circuitous course broken therebetween by a wall 16 having side flanges 17. The Wall 16 and the flanges 17 carry a coal or fuel door 18 and flue cleanout doors 20 respectively.

Circulating lines 21 have connection at their rearmost inwardly projecting ends with the furnace flue pipe 22 and upon opposite sides thereof and through which the smoke may be transmitted transversely of the furnace in arcuate paths toward opposite sides of the fuel door 16 for communication with passages 23 vertically disposed behind the doors 20.

A succession of circulating fines 24 of arcuate formation arranged in staggered relation within the compartment 15 are joined or otherwise communicated at their rearmost inwardly projecting ends through the employment of a housing 25'. The lowermost fiue'sections 26 are in communication with the furnace flue pipe 22 beyond the damper 26 therefor through the provision and arrangement of a conduit 27. From an understanding of the Figure 4 illustration it is gathered that the forward innermost projecting ends of the circulating fiues 24L are also disposed for communication in a manner similar to that provided for the flues21. The fiues 2 1 differ from the fines 21, however, in that the former are provided with troughs 28 upon the upper surfaces thereof to accommodat-e bodies of water constantly replenished by a feed pipe 29 whereby the uppermost of the troughs, when overfilled, will allow the water to trickle down one side thereof due to the fact that one side wall of the trough is lower than the other.

A drip flange 29 carried upon the under sides of the intermediate fines 24, are located immediately above the troughs of the "next succeeding lowermost troughs whereby the water precipitating from the uppermost of ,the fines will be deposited within the trough of the lowermost flue. The trough ofthe lowermost of the fines is provided with a, drain pipe 30. The latter is merely provided as a precaution against overfilling of the troughs inasmuch as it is our purpose to circulate enough of the ordinary wasted heat and smoke through the fines for the purpose of transforming the water within the troughs into steam whereby the air emitted through the conduits 12 will be of a humidified character. The shutting of the damper 26 to cut off the flow of smoke and wasted heat through the furnace flue pipe 22 will cause the smoke and heat to travel laterally through the entrance ends of the flues 21 toward the front of the furnace downwardly through the passages 23 for communication with the interior of the uppermost of the fines 24. This is repeated until the last of the flues is reached which opens into the conduit 27 to emit the spent smoke through the furnace flue pipe 22 beyond the damper 26.

The invention is susceptible of various changes in its form, proportions and minor details of construction and the right is herein reserved to make such changes as properly fall within the scope of the appended claims.

Having described the invention, what is claimed is 1. A heating furnace comprising a heating chamber a housing enclosing said chamber and spaced therefrom to provide a compartment therebetween, a flue pipe, smoke flues projecting laterally within the compartment, complemental smoke flues in communication with the first mentioned flues having a point of discharge beyond the inlet ends of the first mentioned fines, and water troughs carried upon the complemental flues.

2. A hot air furnace comprising a combustion chamber having a housing enclosing said chamber and spaced therefrom to provide a compartment therebetween in communication with the heat collecting dome of the furnace, a flue pipe, smoke flues having communication and laterally projecting from the flue pipe within said compartment, complemental smoke flues arranged in stagger-ed relation within the compartment and in communication with the other ends of the first mentioned smoke flues, a housing establishing communi cation between the other ends of the complemental smoke flues, water troughs carried upon the upper sides of the complemental smoke flues, and the lowermost of the complemental smoke flues being in communication with the furnace flue pipe beyond the entrance ends of the first mentioned smoke flues.

3. A hot air furnace comprising a combustion chamber having a housing enclosing said chamber and spaced therefrom to provide a compartment therebetween in communication with the heat collecting dome of the furnace, a flue pipe, smoke flues having communication with and laterally projecting from the flue pipe within said compartment, complemental smoke fiues arranged in staggered relation within the compartment and in communication with the other ends of the first mentioned smoke flues, a housing establishing communication between the other ends of the complemental smoke flues, water troughs carried upon the upper sides of the complemental smoke flues, drip flanges for the complemental smoke flues disposed immediately above the troughs of the next succeeding flues, and the lowermost of the complemental smoke flues being in communication with the furnace flue pip-e beyond the entrance ends of the first mentioned smoke flues.

In testimony whereof we affix our signatures.

ROBERT SANDWICK. EMIL DAHLSTROM. 

